A corpora



F. A. AND B. P. DEXTER.

FAClNG TOOL FOR DRESSING VALVE SEATS, m.

APPLICATION FILED JAN2, 1919. 1,325,278.

Patented Dec. 16,1919.

3 SHEETSSHEET 1 F. A. AND B, P. DEXTER. FACING TOOL FOR DRESSING VALVESEATS, &c.

APPLICATION FILED JAN-2, I919.

Patented Dec. 16,1919.

3SHEET$SHEET 2- Merzfimy F. A. AND B. P. DEXTER.

FACING IOOL FOR onessma VALVE SEATS, ac.

APPLICATION FILED JAN. 2, 1919.

1,325,278. Patented Dec. 16,1919.

3 SHEETS-SHEET 3- WZO/(OACQI STATS ATENT UFFlCE.

FRED A. DEXTER AND BAYARD 1?. DEXTER, 0E ORANGE, MASSACHUSETTS,ASSIGNORS TO THE LEAVITT MACI-ZENE COMPANY, SF ORANGE, MASSACHUSETTS, ACORPORA- TION OF MASSAGIESU'EFETTS.

FACING-TOOL FOR DRESSING- VALV E-SEATS, 8w.

Application filed January 2, 1919.

To all whom 2'2? may concern:

Be it known that we, FRED A. DEXTER and BAYARD P. DEXTER, citizens ofthe United States, residing at Orange, county of Franklin, State ofMassachusetts, have invented certain new and useful Improvements inFacing-Tools for Dressing Valve-Seats, &c.; and we do hereby declare thefollowing to be a full clear, and exact description of the invent-ion,such as will enable others skilled in the art to which it appertains tomake and use the same.

This invention relates to a tool for dressing valve seats and the like,and more especially to a tool adapted for re-cutting such elements thathave become worn or pitted in use, so as to provide a uniform fluidtight contact between the valve and the seat or seats. The object of theinvention is to provide a compact, strong, substantial and efficienttool adapted to operate on valves of various sizes and characters,either while the valves are in position on the pipe line, or in certaincases when the valves have been disconnected from the line. To theseends, the invention comprises a frame provided with a plurality ofoppositely movable and adjustable holding elements, preferablyconstituted by slides mounted for reciprocatory movement in the frameand carrying lugs adapted to be engaged with either the inside oroutside of the valve casing to clamp the frame thereto, said frame beingprovided with means for adjusting the slides to clamping position, saidmeans preferably being in the form of a rotatable shaft having right andleft screw threads thereon engaging corresponding threaded portions ofthe respective slides, a hollow standard mounted on one face of theframe and carrying a reciprocatory and rotatory spindle adapted to beengaged with a cutter or facing tool which operates on the valve seat tobe refaced, said spindle being associated with a feed screw, in the formof a hollow sleeve having exterior threads which engage an interiorthread on the upper part of the standard, which latter is provided witha special form of means for locking and unlocking the feed screw, sothat the latter may be actuated to feed the spindle forward during theeffective operation of the cutting tool.

Specification of Letters Patent.

Patented Dec. 16, 1919.

Serial No. 269,383.

Fig. 3 is a vertical longitudinal section through the apparatus asapplied to an ordinary globe valve.

Fig. 4: is an elevation, partly in section, of the tool as applied forfacing the seat of a sliding gate valve.

Fig. 5 is a detail of the attachment for connecting the spindle and'thefacing tool as shown in Fig. 4.

Many types of valve seat re-facing or dressing tools have beenheretofore suggested and employed, but, so far as applicants areadvised, these tools of the prior art have been'limited in theirapplication to valves of certain definite types and substantiallyuniform sizes so that special tools must be provided for operating uponvalves of different types, anddiflferent sized tools must be constructedfor varying sizes of valves of the same type. The present invention,however, is designed to present in a single instrumentality a form oftool which is not only capable of ready and efficient application tovalves of the different standard types, such as various forms of globevalves and the many modifications of sliding gate valves, but also tovarious sizes of valves of the same'general type. For example, in thedrawings, the tool is exemplified in two of its modes of effectiveapplication, that represented in Fig. 3, illustrating it applied to anordinary fiatseated globe valve and that shown in Fig. l representingthe tool applied to a slidingvgate valve. The application of the tool toother forms of valves will be obvious to those skilled in the art.

Referring to Figs. 1 to 3 of the drawings, the base of the toolcomprises a generally rectangular frame having longitudinal mem- 1, 2and permit said slides to be moved longitudinally of the frame.

Projecting from the under face of the slides 5 and 6 are lugs 7 and 8respectively, one of which lugs, as 7, is provided with a convex outerlateral surface and a concave inner lateral surface, both of saidsurfaces being scored or grooved to provide grippin surfaces for eitherthe inner or outer wall or a valve casing. The other lug or jaw S isprovided with two convex outer faces and two concave inner faces, all ofwhich faces are scored or grooved similarly as the faces of lug or jaw7. The lugs or jaws as thus constituted are therefore adapted to engagethe inner or outer surface of the valve casing adjacent one of theopenings in the easing, and thereby lock the frame securely to thecasing and center the frame with respect to the valve seat to be groundor dressed. The automatic centering of the frame and therefore of thetool with respect to the valve seat is facilitated by the three-pointcontact between the engaging faces of the lugs 7 and 8 and the valvecasing, whether said contact be made exteriorly or interiorly of thevalve casing. In Fig. 3, the jaws 7 and 8 are shown engaged with theinterior of the valve casing,.but fora smaller valve casing the sameeffect would be produced by engaging the lugs with the exterior walls ofthe valve casing, as will be apparent.

In order to move the slides 5 and 6 simultaneously and to the sameextent in opposite directions to effect the clamping of the frame to thevalve casing, there is journaled in the end members 3 and 4: of theframe a shaft 9 provided with right and left-hand screw threadsrespectively extending from the middle toward the ends which screwthreads engage correspondingly threaded openings in the slides 5 and 6,so that when the shaft 9 is turned in one direction or the other bymeans of the hand wheel 10, the slides 5 and 6 are moved toward or awayfrom each other and into gripping engagement with the valve casing asdescribed. The shaft 9 is locked against longitudinal movement by meansof a set collar 12 and the hand wheel 10 is locked to said shaft bymeans of a suitable nut 11.

Mounted on the outer face of the frame and secured to the side members 1and 2 thereof is a standard comprising a square base member 13 fastenedto the frame by bolts 14:, from which base rises a hollow standard 15,the upper portion of which is provided with a tapered eXteriorlyscrewthreaded portion 16 divided into sectors by a cross kerf 17. Thelower portion of said spindle is provided with a longitudinal bearing inwhich the tool spindle 20 rotates.

Said tool spindle 20, which is journaled in the standard 15 has itsupper portion reduced to take the inner bore of a hollow feed screw orsleeve 25, the exterior screw threads of which engage the inner threadedneck of the standard 21. The spindle 20 and the feed screw 25 are eachprovided with hand wheels 22 and 26 respectively to rotate thecorresponding members. The longitudinal axis of the spindle 20 is normalto the plane of the frame, and the spindle is located midway between theslides 5 and 6 and is therefore centered with respect to the lugs 7 and8 for all relative positions of the latter. The spindle 20 is freelyrotatable in its bearings in the standard 15 and the feed sleeve 25respectively, and is moved transversely through the frame in eitherdirection by means of the feed screw 25, when the hand wheel 26 thereofis rotated, by reason of the engagement of the exterior screw threads onthe sleeve 25 and the interior threads on the upper end of the standard15.

in order to lock the feed screw against rotatory movement, the split,tapered and threaded upper end of the standard 15 is engaged by aclamping collar 18 which when turned up on the screw threads 16 of thestandard compresses the sectional end portions of the standard andcauses them to firmly grip the feed screw 25 and prevent rotation of thelatter. When it is desired to operate the feed screw either to feed thespindle forward or to retract the latter, the nut 18 is backed off asufiicient distance to permit the sectional ends of the standard 15 tomove outward and relieve the clamping action between the same and thefeed screw 25.

The end of the spindle 20 is provided with a screw-threaded projection23, which in this particular embodiment of the invention is adapted toengage a central opening in a disk-like cutting or dressing tool 24, thelower face of which engages the valve seat ll to re-surface the samewhen the spindle 20 is rotated, the depth .of the cut produced by thefacing tool being regulated by means of the feed screw 25 which advancesthe spindle and the cutting tool toward the work. After a sufficientamount of the metal in the valve seat has been removed to restore theuniform surface of the seat. the feed screw is locked to the standard bysetting up the nut 18, after which the spindle and its associatedcutting tool 24: may be rotated to efiect a smooth, even finish of thevalve seat.

The mode of applying the tool to a globe valve is shown in Fig. 3. Thecap or bonnet of the valve having been removed, the supporting frame ofthe tool is laid on top of the valve casing and the slides 5 and 6adjusted by means of the screw shaft 9 so that the lugs 7 and S arebrought into gripping engagement with the inner screw threaded surfaceof the opening in the valve casing. The three-point bearing between thelugs 7 and 8 and the inner walls of the valve casing insures an accuratecentering of the spindle 20 with respect to the valve seat, and as thelatter is parallel with the upper marginal edges of the opening in thevalve casing, the tool 24 is presented in parallelism with the valveseat, so that, when said tool is fed forward into contact with the seatby means of the feed screw 25, which advances the spindle 20, a fewturns of the spindle 20 by means of hand wheel 22 will accurately dressand re-surface the valve seat.

Should the opening in the valve casing be too small to convenientlyreceive the lugs or aws 7 and 8 inside said opening, in order toproperly mount and clamp the tool to the valve casing, it is onlynecessary to adjust the slides 5 and 6 so that the lugs 7 and 8 will lieoutside of the walls surrounding the opening in the valve casing, afterwhich the shaft 9 is rotated to bring the inner faces of the jaws 7 and8 into engagement with the outer walls of the valve casing, therebylocking the frame and the appurtenant parts of the tool to the valvecasing. It will thus be seen that a single tool of the type described,will accommodate valves of many different sizes and that by merelyadjusting the slides 5 and 6 and the clamping jaws 7 and 8 carriedthereby, the tool may be accurately and firmly clamped in properposition on any valve casing within the limits of adjustment of theslides.

Fig. 4 of the drawing shows the tool as applied to dressing one of theseats of a sliding gate valve. In operating upon this type of valve, itis necessary to remove the entire valve from the pipe line and toseparate the valve proper and its hood from the casing, whereas inapplying the tool to a globe valve or valve of similar type, as shown inthe preceding figures, it is not necessary to remove the valve from thepipe line or other connection inasmuch as the tool may be applied to thevalve casing in situ.

In applying the tool to a sliding gate valve, the base frame of the toolis secured to one of the fluid passages of the valve casing by engagingthe clamping lugs 7 and 8 either exteriorly or interiorly of the portionof the valve casing surrounding such opening. As shown, the base frameis clamped to the casing by the lugs 7 and 8 engaging the interior wallsof the opening, opposite that in which the seat which is to be dressedis located, so that the spindle 20 of the tool is in axial alinementwith the inlet and outlet openings of the valve casing.

For dressing the seats of gate valves, a special dressing or cuttingtool is employed, preferably of the type shown in patent to Williams 8:Smith, No. 1,227,514, dated May 22, 1917, which comprises a rotary diskor cutter head 50, provided with a series of cutters 51 on one facethereof, said cutter having associated therewith a handle 52 adapted tobe operatively connected with the disk by means of a pawl and ratchetfriction band or similar means, whereby oscillation of the handle willproduce a step by step rotary motion of the cutter head, thereby causingthe cutters to resurface the face of the valve seat ring with which thecutter is engaged. This cutting tool is passed into the valve casingthrough the upper opening thereon, after the bonnet and valve have beenremoved, and is properly centered to bring the cutters into engagementwith the valve seat by means of an extension head 20, which is screwedon to the end of the spindle 20, said extension head having a roundedend which engages a central opening or depression 53 in the cutter head50.

As illustrated in Fig. 4c, the frame of the tool is secured to one endof the valve casing, in the opening opposite that in which the seat tobe ground is located. The cutter head is then passed through the upperopening in the valve casing and the feed screw 25 operated to advancethe spindle until the end of the extension piece 20' engages the centralopening 53 in the cutter head and forces the cutters 51 into contactwith the face of the valve seat ring. The cutter head 50 is therebybrought into parallelism with the face of the valve seat ring, so thatwhen rotary motion is imparted to the cutter head, the cutters willaccurately trim the face of the seat ring, the depth of the out beingdetermined by the feed screw 25, as will be understood. After one of theseat rings has been ground, the cutting tool is reversed and applied tothe opposite end of the valve, in the same manner to permit the otherseat to be dressed. v

From the foregoing, it will be apparent that theinvention is capahle ofgeneral application to valves of various types and sizes, andconstitutes a simple, durable mechanism, capable of being quicklyadjusted and ofiering no delicately constructed or connected parts tobecome deranged or broken, so that a single apparatus of the characterdescribed involving a reasonable number of cutting elements of theparticular types shown, will serve the purpose of a large number ofunits of varying sizes of the types as heretofore employed for dressingvalve seats.

What we claim is 1. A tool of the class described, comprising a frame, asingle pair of slides mounted for movement in opposite directions onsaid frame, means for moving said slides, means on the slides forengaging the interior or exterior of the valve casing at three pointsarranged in triangular relation, and means supported by said frame forengagement with a dressing tool,

2. A tool of the class described, comprising a frame, a pair of slidesmounted in said frame for movement in the opposite directions, means formoving said slides, means projecting from the slides for engaging theinterior or exterior of a valve casing at three points arranged intriangular relation, and a tool spindle supported by said frame.

3. A tool of the class described, comprising a rectangular frame, a pairof slides mounted on said frame for movement in opposite directions,lugs on the slides for engaging the interior or exterior of a valvecasing at three points arranged in triangular relation, a standardcarried by said 15 frame, a spindle mounted in the standard and extendedthrough the frame intermediate said slides for engagement with adressing tool, and an oppositely threaded shaft engaged with the slidesbetween the 20 FRED A. DEXTER. BAYARD P. DEXTER.

